It seems that step by step is missing a hyphen. Consider adding the hyphen(s).
It seems that procedure may not agree in number with other words in this phrase.
The noun phrase thin piece seems to be missing a determiner before it. Consider adding an article.
The noun phrase saw seems to be missing a determiner before it. Consider adding an article.
Usage of linking words is important in IELTS writing. They help create clear connections between ideas in your writing. They improve the flow of your essay by showing relationships between paragraphs and sentences. Using appropriate linking words demonstrates your ability to write cohesively and will help you achieve a higher band score.
It seems that there is an article usage problem here.